28865916 has 24 divisors (see below), whose sum is σ = 74837840. Its totient is φ = 9621936.

The previous prime is 28865911. The next prime is 28865987. The reversal of 28865916 is 61956882.

It is a super-2 number, since 2×28865916² = 1666482213038112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28865911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133531 + ... + 133746.

Almost surely, 2^28865916 is an apocalyptic number.

It is an amenable number.

28865916 is an abundant number, since it is smaller than the sum of its proper divisors (45971924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28865916 is a wasteful number, since it uses less digits than its factorization.

28865916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267290 (or 267282 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 28865916 is about 5372.7009967055. The cubic root of 28865916 is about 306.7574468694.

The spelling of 28865916 in words is "twenty-eight million, eight hundred sixty-five thousand, nine hundred sixteen".